| 摘要 |
PURPOSE: A branched post-sulfonated multiblock copolymer is provided to be used for a fuel cell membrane, an ion exchange membrane, a dehumidification membrane, and a humidification membrane, by having extremely low methanol transmittancy and dimensional change rate. CONSTITUTION: A branched post-sulfonated multiblock copolymer includes a perfluorocyclobutane group represented by chemical formula 1. The weight average molecular weight of each block is 1,000-100,000, and the weight average molecular weight of the multiblock copolymer is 10,000-1,000,000. A membrane-electrode assembly includes a cathode; an anode; and a polymer electrolyte film between the cathode and the anode, and contains the branched post-sulfonated multiblock copolymer as the polymer electrolyte film. |
